JP2002209911A - Hand piece for dental sand-blast and its using method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hand piece for a dental sand-blast that can be used with an attention concentrated to a hand, has high operability, and hardly fails, and its using method. SOLUTION: A foot switch is eliminated. An operating lever is disposed in the hand piece, and allows control of start and stop of spray. A general-purpose valve device is not employed for the control of the start and stop of the spray, and a soft tube is crushed to stop injection. This hand piece employs a structure in which a soft tube as a cleaning liquid passage and a soft tube as an abrasive powder passage are piled and crushed, thereby miniaturizing, lightening, and simplifying a press mechanism for crushing. For blowing off the cleaning liquid adhered to the tip of an injection nozzle by slightly early stopping the spray of the cleaning liquid in stopping the entire spray, and allowing a series of controls for stopping the injection of the abrasive powder after drying without using a complex control mechanism, a pressure of the cleaning liquid is controlled to be not higher than an injection pressure of the abrasive powder.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hand for dental sandblasting, wherein a tooth or a denture is polished or cut by spraying an abrasive powder such as a baking soda powder or a plant seed powder together with a cleaning liquid on the tooth or the denture. About the piece. The invention particularly relates to a spray control mechanism for starting and stopping such handpiece spraying.

[0002]

2. Description of the Related Art Conventionally, a spray control of a dental sandblasting apparatus has been configured to be operated by a foot switch. This means that if the handpiece is equipped with a general-purpose pneumatic control valve to control the spraying, it will prevent the valve seal from being caught by the abrasive powder and impairing the valve's sealability. To do that.

[0003]

However, since the dental clinic is already provided with a foot-operated switch for controlling the air turbine, the intended foot-operated switch can be accurately operated in a small work space. That put a lot of effort on the surgeon, who was under great stress.

[0004] Further, since the sandblasting apparatus main body and the handpiece are connected by a tube (uncontrolled passage) of about several tens of centimeters to one meter, an abrasive or a cleaning liquid is supplied through this tube. If you operate the foot switch to control the spraying with the sandblasting body, the movement of the abrasive and cleaning solution in the tube will be delayed, and such poor operability will also fatigue the operator,
This made it difficult to concentrate on treatment. In addition, the cleaning liquid and the abrasive that gradually leak from the uncontrolled long passage after the spraying stops are solidified at the tip of the spray nozzle, and a failure that frequently clogs the spray nozzle frequently occurs. there were.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a operable dental sandblasting hand which can alleviate the patient's pain and reduce the operator's labor. To provide a piece.

[0006]

A handpiece for solving the above-mentioned problem is a dental sandblast which is designed to polish or cut a tooth or the like by spraying a cleaning liquid and an abrasive accelerated by compressed air on the tooth or the like. In the handpiece for use, a cleaning liquid passage and an abrasive passage constituted by a soft tube are respectively provided, and spraying is stopped by crushing the soft tube by a repulsive force of a spring.

Since the handpiece is provided with a spray control function, there is no need to operate a foot-operated switch, and since the spray is controlled at a position about 10 cm from the spray nozzle, the response speed of spray start / stop is fast and, in addition, soft Since the spraying is stopped by crushing the tube, there is no possibility that a failure due to biting of the abrasive into the seal portion is liable to occur as in a general-purpose valve device.

In the above configuration, it is preferable that two soft tubes be overlapped and crushed.

If two soft tubes, that is, a soft tube serving as an abrasive passage and a soft tube serving as a cleaning liquid passage are overlapped and crushed, the spraying can be stopped by one press device. Can be made small, light, and inexpensive, and if crushed in a stack, the difference in the repulsive force of two soft tubes causes the press device to tilt and the operation to be unstable, as in the case of crushing side by side. Evil effects can be prevented.

It is preferable to use the handpiece having the above-mentioned structure while controlling the pressure of the cleaning liquid to be equal to or lower than the injection pressure of the compressed air.

When the pressure of the cleaning liquid is controlled to be equal to or lower than the injection pressure of the compressed air, and the two soft tubes, which are the respective passages, are overlapped and crushed, the soft tubes which are the cleaning liquid passages having a low repulsive force and maintained at a low pressure are obtained. Is crushed slightly earlier and spraying stops. At that time, the cleaning liquid may slightly remain at the tip of the spray nozzle, but the cleaning liquid is blown off by spraying the abrasive for a fraction of a second until the spraying is stopped with a slight delay, and the slurry is formed at the tip of the spray nozzle. It is possible to prevent a failure in which the spray nozzle is clogged due to solidification of the lost abrasive.

[0012]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 shows an example of the handpiece of the present invention. An operation lever 3 is fixed to the handpiece main body 1 by a shaft 2 so as to be able to move freely. A connecting rod 4 is fixed to the operation lever 3, a forked arm 5 is connected to the tip of the connecting rod 4, a moving pressing rod 6 is fixed to the tip of the arm 5, and the moving piece is moved to the handpiece body 1. The fixed pressing rod 7 is fixed to face the pressing rod 6, and the helical spring 8 is compressed and inserted between the operation lever 3 and the handpiece body 1, and the movable pressing rod 6
Is always pressurized so as to move in the direction of the fixed pressing rod 7. Further, a first soft tube 9 serving as an abrasive passage and a second soft tube 10 serving as a cleaning liquid passage are stacked in the handpiece body 1 and disposed between the movable pressing rod 6 and the fixed pressing rod 7. One end of the first soft tube 9 is connected to the abrasive supply tube 13 via the metal pipe 11, and one end of the second soft tube 10 is connected to the cleaning liquid supply tube 14 via the metal pipe 12. Further, the injection nozzle 16 is configured to be attached to the tip of the handpiece main body 1 by a fixing screw 15, and the abrasive and the cleaning liquid are guided to the injection nozzle 16 through a passage formed by a general-purpose coaxial double pipe.

In the handpiece constructed as described above, even if the supply of the abrasive to the abrasive supply tube 13 and the supply of the cleaning liquid to the cleaning liquid supply tube 14 are started by operating the main body, the first soft Both the tube 9 and the second soft tube 10 are crushed between the fixed pressing bar 7 and the moving pressing bar 6, so that the abrasive and the cleaning liquid are not guided to the spray nozzle 16.

Next, when the injection nozzle 16 is held toward the tooth surface to be cleaned or the like and the operation lever 3 is pushed in against the force of the helical spring 8, the movable pressing bar 6 separates from the fixed pressing bar 7. The two soft tubes that have been squeezed and crushed are restored by their own elastic restoring force and the pressure of the compressed air or the cleaning liquid, and the abrasive and the cleaning liquid are ejected by the spray nozzle 16.
, And sprayed toward the tooth surface and the like, and can efficiently clean dirt and the like adhered to the tooth surface and the like.

After the predetermined cleaning, the operation lever 3
Is released, the operating lever 3 returns due to the restoring force of the helical spring 8, and the movable pressing rod 6 moves in the direction of the fixed pressing rod 7, crushing the two soft tubes almost simultaneously, and immediately spraying. Can be stopped.

The function of starting and stopping the spraying will be described in detail with reference to sectional views (FIGS. 2 and 3). FIG. 2 shows a state in which the spraying is being performed, and FIG. 3 shows a state in which the spraying is stopped.

In the state where the spraying is started (FIG. 2), the operation lever 3 is pressed against the restoring force of the helical spring 8.
Is pushed in the direction of the handpiece body 1, so that the movable pressing rod 6 is fixedly pressed by the connecting rod 4 and the arm 5.
The two soft tubes (9, 10) which are moved in the direction away from the moving press rod 6 and the fixed press rod 7 are opened by the restoring force and the pressure of the compressed air or the cleaning liquid inside, and the polishing is performed. The abrasive supplied by the material supply tube 13 and the cleaning liquid supplied by the cleaning liquid supply tube 14 are guided to the injection nozzle 16 without being hindered.

When the predetermined spraying is completed, when the operating lever 3 is released, the operating lever 3 moves upward in the figure by the restoring force of the helical spring 8, and is moved and pressed by the connecting rod 4 and the arm 5. The rod 6 moves in a direction approaching the fixed pressing rod 7, and the two soft tubes (9, 10) arranged between the moving pressing rod 6 and the fixed pressing rod 7 are crushed and supplied by the abrasive supply tube 13. The abrasive and the cleaning liquid supplied by the cleaning liquid supply tube 14 are shut off at this portion, and the spraying shown in FIG. 3 is stopped.

FIG. 4 shows an example of a pneumatic circuit of an apparatus body for using the handpiece of the present invention. A first joint 41 is provided in the apparatus main body, and a compressed air passage passing through a main valve 42 is divided into two systems, one of which is connected to a second through a pressure reducing valve 43 for adjusting abrasive injection pressure, a filter 44, and an abrasive tank 45. The other end is connected to a third joint 50 via a pressure reducing valve 47 for adjusting the cleaning liquid injection pressure, a cleaning liquid tank 48, and a cleaning liquid flow rate adjusting valve 49.

In the thus constructed measure main body, the first joint 41 is connected to the first joint 41 by a compressor or the like at a pressure of 0.4 MPa.
A degree of compressed air is supplied, the abrasive supply tube 13 is connected to the second joint, and the cleaning liquid supply tube 14 is connected to the third joint. Then, when the main valve 42 is operated, the pressure of the abrasive material injection pressure is reduced to 0.3 M by the pressure reducing valve 43.
The abrasive tank 45 in which the abrasive has been loaded in advance is filled with compressed air reduced to a predetermined spray pressure of about Pa. Further, the pressure is reduced by a pressure reducing valve 47 for adjusting the cleaning liquid injection pressure.
The cleaning liquid tank 48 in which the cleaning liquid has been previously charged is filled with compressed air reduced to a predetermined spray pressure of about 1 MPa. The abrasive may be a commercially available baking soda powder, or the washing solution may be tap water.

Next, when the operating lever 3 of the handpiece body 1 is operated, the closed portions of the two soft tubes (9, 10) are instantaneously opened, and the abrasive in the abrasive tank 45 is rolled up and pressed. The air is supplied to the handpiece body 1 together with the air, and is sprayed from the injection nozzle 16 onto the tooth surface or the like.
At substantially the same time, the cleaning liquid in the cleaning liquid tank 48 is pressurized by the compressed air, supplied to the handpiece body 1, and sprayed from the injection nozzle 16 onto the tooth surface or the like.

When the cleaning operation is completed and the operating lever 3 of the handpiece body 1 is released, the pressure of the cleaning liquid is set lower than that of the abrasive, so that the second soft tube 10 having a low internal pressure is discharged for several minutes. 1 second earlier, the spraying of the cleaning liquid is first stopped, and the cleaning liquid at the tip of the injection nozzle 16 is blown off by the compressed air. Next, after a fraction of a second, the first soft tube 9 having a high internal pressure is closed, and the spraying can be stopped with the tip of the injection nozzle 16 being dry.

When the predetermined spraying is completed, the main valve 4
2, the abrasive in the abrasive supply tube 13 returns to the abrasive tank 45 due to the flow of the exhaust airflow, and only the compressed air that has passed through the filter 44 is supplied to the main valve 42.
Exhaust from the exhaust port. On the other hand, the cleaning liquid tank 48
Since the compressed air inside is also exhausted in the same manner, unexpected spraying of the cleaning liquid can be prevented.

[0025]

Since the present invention is configured as described above, it has the following effects.

Since the handpiece body is provided with a mechanism for stopping spraying, the treatment can be performed with the nerve concentrated at hand, so that the operator's mental labor can be reduced and the treatment can be completed efficiently. From the patient's welfare. In addition, the device can be provided simply and inexpensively, and because it has a configuration that can effectively prevent failure due to clogging of the injection nozzle, it leads to the spread of efficient tooth surface cleaning by dental sandblasting and makes it impossible for people with disabilities and bedridden It contributes to the promotion of oral health among citizens as well as certain elderly people.

[Brief description of the drawings]

FIG. 1 is a partially cutaway plan view showing an example of a dental sandblasting handpiece of the present invention.

FIG. 2 is a sectional view showing an example of a dental sandblasting handpiece of the present invention in a spraying start state.

FIG. 3 is a cross-sectional view showing an example of the dental sandblasting handpiece of the present invention in a spray stopped state.

FIG. 4 is a circuit diagram showing an example of a pneumatic circuit of a device main body for using the handpiece of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Handpiece main body 2 shaft 3 Operation lever 4 Connecting rod 5 Arm 6 Moving pressing rod 7 Fixed pressing rod 8 Hanging spring 9 First soft tube 10 Second soft tube 13 Abrasive supply tube 14 Cleaning liquid supply tube 16 Injection nozzle 42 Main Valve 43 Pressure Reducing Valve for Abrasive Injection Pressure Adjustment 44 Pressure Reducing Valve for Cleaning Injection Pressure Adjustment 45 Abrasive Material Tank 46 Cleaning Solution Tank

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) A61C 17/02 H 17/036

Claims (3)

[Claims] 1. A handpiece for dental sandblasting in which a cleaning solution and abrasives accelerated by compressed air are blown onto teeth or the like to polish or cut the teeth or the like, wherein a soft tube is formed inside the handpiece. A handpiece for dental hand blasting, wherein a cleaning liquid passage and an abrasive passage are provided, respectively, and spraying is stopped by crushing the soft tube by a repulsive force of a spring. 2. The cleaning liquid passage and the abrasive passage formed by a soft tube are overlapped and crushed.
Based on handpiece. 3. The handpiece according to claim 2, wherein the pressure of the cleaning liquid in the cleaning liquid passage formed by the soft tube is controlled to be equal to or lower than the injection pressure of the compressed air in the abrasive passage formed by the soft tube. How to use